LLAGUNO, Elma.
Humic Substances from Manila Bay and Bolinao Bay Sediments.
Science Diliman: A Journal of Pure and Applied Sciences, [S.l.], sep. 2007.
ISSN 2012-0818.
Available at: <https://www.journals.upd.edu.ph/index.php/sciencediliman/article/view/261>. Date accessed: 06 sep. 2025.